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TR6 1973 TR6 plugs

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If you like Champion Spark plugs, those are OK if most of your driving is high speed.
My engine burns a little cleaner with Champion RN12YC (404) which is a little 'hotter".
 
I've had good luck with NGK plugs. The N9Y/N9YC/RN9YC family crosses to the BP6ES/BPR6ES while the toastier N12Y/N12YC/RN12YC crosses to the BP5ES/BPR5ES. All the "R" indicates is that it is the resistor variant of the plug for both Champion and NGK.
 
Been running the 12's for many years, wish all parts on the car would hold up as well as they do.

Wayne
 
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